In this scheme depicted in Fig. 5, photons are employed for entanglement generation and distribution between two remote nodes by incidence of laser beam on crystal. Use of photons is advantageous as they can travel with high speed and can cover long distance in fiber channels with least amount of attenuation. Thus, photons are promising candidates for entanglement creation [1]}, [2]}. Photons are also associated for moderate amount of decoherence and noise as they least interact with the environment [3]}. In Optical parametric down conversion method, a laser beam is incident on birefringent crystal, which converts photon beams into pair of correlated photons with the help of non-linear effects of crystal[4]}. The entangled photons are vertically and horizontally polarized which are individually transported to Alice and Bob so that any measurement at Alice is reflected at Bob with superluminal speed irrespective of the distance between them.
<FIGURE>